.yf-button {
    display: inline-block;
    margin: 10px;
    border-radius: 5px;
    padding: 8px 15px;
    background-color: aqua;
    color: #fff;
    cursor: pointer;
}

.yf-button--large {
    padding: 10px 20px;
}

.yf-button--medium {
    padding: 8px 15px;
}

.yf-button--small {
    padding: 4px 8px;
}

.yf-button:active {
    filter: grayscale(0.3);
}